Efficient Regioselective Synthesis of 6-Amino-5-benzoyl-1-Substituted 2(1<i>H</i>)-Pyridinones
作者:Hartmut Schirok、Cristina Alonso-Alija、Jordi Benet-Buchholz、Andreas H. Göller、Rolf Grosser、Martin Michels、Holger Paulsen
DOI:10.1021/jo0515428
日期:2005.11.1
A regioselective and efficient approach toward 6-amino-5-benzoyl-1-substituted 2(1H)-pyridinones by reaction of acyclic ketene aminals with propiolic acid ester was developed. The effect of the solvent and temperature on the regioselectivity of the reaction and the compatibility of the target compounds to functional group manipulations was examined. Substrates with an ortho substituent build atropisomers
提出了一种通过无环烯酮缩醛与丙酸酯反应生成6-氨基-5-苯甲酰基-1-取代的2(1 H)-吡啶酮的区域选择性有效方法。检查了溶剂和温度对反应的区域选择性以及目标化合物与官能团操作的相容性的影响。具有邻位取代基的底物由于绕CN键的旋转受限制而形成阻转异构体。分离对映体,并通过实验确定旋转的障碍。量子化学计算可以对势垒高度进行排序,并提出了通过中央吡啶酮部分变形而产生的新的旋转机理。